"Are you about to come, Robert?" Cindy asked in an excited voice. "Are you gonna come?"

"Ohhhh, yes!" Robert grunted.

Kathy's eyes jumped to the head of his cock, and she stared in a dazed way as he began to come.

"Oooooch, you're doing it, Robert!" Cindy squealed. "You're coming now, Robert!" Her fist jerked rapidly on her brother's gushing cock.

Kathy saw the thick, pearl-white come juice squirt from the flaring piss hole of his cock. She saw a glob splash on her thigh, and the feel of it sent her cunt into wild convulsions. Her pussy went tight, then relaxed, only to tighten up again. She was coming as Robert came. Her eyes, almost glassy, watched his cock spurt come juice over her thighs until they were almost coated with it. And she could not stop herself from coming off, too.

After Cindy released her brother's cock and they had gone out of the room and returned with soft drinks, Kathy sat in a slumped shame, seeing the come juice glisten on her tanned, long thighs. Her cunt had finally calmed down, but there was still a deep burning sensation. She watched them as they sat on the floor sipping their sodas. They seemed to have forgotten her, and she no longer tried to fight against the ropes that held her.

She had become very excited by what had happened. Despite being bound up this way, helpless, in the hands of two children only a few years younger than her, Kathy had experienced the peak of erotic pleasure. She had watched him come all over her thighs, and she had come off, too. The crotch of her panties was moist and felt uncomfortable now.

She couldn't understand why she had responded to this. Never in her life had she been excited by being in a helpless position, exposed this way.